کد XAML مربوط به دکمه و style اش رو بذارید
<Style x:Key="HelpBtn" TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal">
<Storyboard>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Offset)" Storyboard.TargetName="path">
<EasingDoubleKeyFrame KeyTime="0" Value="0.9"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Childr en)[3].(TranslateTransform.Y)" Storyboard.TargetName="contentPresenter">
<EasingDoubleKeyFrame KeyTime="0" Value="-1"/>
</DoubleAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="path">
<EasingColorKeyFrame KeyTime="0" Value="#FF1A3978"/>
</ColorAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Color)" Storyboard.TargetName="path">
<EasingColorKeyFrame KeyTime="0" Value="#FFAEC0E2"/>
</ColorAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.StrokeThickness)" Storyboard.TargetName="path">
<EasingDoubleKeyFrame KeyTime="0" Value="3"/>
</DoubleAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Stroke).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="path">
<EasingColorKeyFrame KeyTime="0" Value="#FFEFE9F5"/>
</ColorAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Childr en)[0].(ScaleTransform.ScaleX)" Storyboard.TargetName="path">
<EasingDoubleKeyFrame KeyTime="0" Value="1.008"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Childr en)[3].(TranslateTransform.X)" Storyboard.TargetName="path">
<EasingDoubleKeyFrame KeyTime="0" Value="-0.5"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Childr en)[0].(ScaleTransform.ScaleY)" Storyboard.TargetName="path">
<EasingDoubleKeyFrame KeyTime="0" Value="0.962"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Childr en)[3].(TranslateTransform.Y)" Storyboard.TargetName="path">
<EasingDoubleKeyFrame KeyTime="0" Value="-1"/>
</DoubleAnimationUsingKeyFrames>
<PointAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(LinearGradientBrush.EndPoint)" Storyboard.TargetName="path">
<EasingPointKeyFrame KeyTime="0" Value="0.428,1.007"/>
</PointAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="MouseOver">
<Storyboard>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Offset)" Storyboard.TargetName="path">
<EasingDoubleKeyFrame KeyTime="0" Value="0"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Offset)" Storyboard.TargetName="path">
<EasingDoubleKeyFrame KeyTime="0" Value="0.73"/>
</DoubleAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="path">
<EasingColorKeyFrame KeyTime="0" Value="#FF192C7E"/>
</ColorAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Childr en)[3].(TranslateTransform.Y)" Storyboard.TargetName="contentPresenter">
<EasingDoubleKeyFrame KeyTime="0" Value="0"/>
</DoubleAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Color)" Storyboard.TargetName="path">
<EasingColorKeyFrame KeyTime="0" Value="#FF8995C6"/>
</ColorAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.StrokeThickness)" Storyboard.TargetName="path">
<EasingDoubleKeyFrame KeyTime="0" Value="3"/>
</DoubleAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Stroke).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="path">
<EasingColorKeyFrame KeyTime="0" Value="#FFFAF9FB"/>
</ColorAnimationUsingKeyFrames>
<PointAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(LinearGradientBrush.EndPoint)" Storyboard.TargetName="path">
<EasingPointKeyFrame KeyTime="0" Value="0.431,1.006"/>
</PointAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="path">
<EasingColorKeyFrame KeyTime="0" Value="#FF7E5315"/>
</ColorAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Color)" Storyboard.TargetName="path">
<EasingColorKeyFrame KeyTime="0" Value="#FF86BCD4"/>
</ColorAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Childr en)[3].(TranslateTransform.Y)" Storyboard.TargetName="contentPresenter">
<EasingDoubleKeyFrame KeyTime="0" Value="-2"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Offset)" Storyboard.TargetName="path">
<EasingDoubleKeyFrame KeyTime="0" Value="0.204"/>
</DoubleAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Stroke).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="path">
<EasingColorKeyFrame KeyTime="0" Value="#FFFAF9FB"/>
</ColorAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.StrokeThickness)" Storyboard.TargetName="path">
<EasingDoubleKeyFrame KeyTime="0" Value="3"/>
</DoubleAnimationUsingKeyFrames>
<PointAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(LinearGradientBrush.EndPoint)" Storyboard.TargetName="path">
<EasingPointKeyFrame KeyTime="0" Value="0.43,1.006"/>
</PointAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Path x:Name="path" Data="M39.5,19 C39.5,29.217268 30.769553,37.5 20,37.5 C9.2304474,37.5 0.5,29.217268 0.5,19 C0.5,8.7827321 9.2304474,0.5 20,0.5 C30.769553,0.5 39.5,8.7827321 39.5,19 z" Stretch="Fill" UseLayoutRounding="False" RenderTransformOrigin="0.5,0.5">
<Path.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform/>
<TranslateTransform/>
</TransformGroup>
</Path.RenderTransform>
<Path.Fill>
<LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
<GradientStop Color="#FFD8CEE4"/>
<GradientStop Color="#FF4D266E" Offset="0.73"/>
</LinearGradientBrush>
</Path.Fill>
<Path.Stroke>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFBACBDA" Offset="0"/>
<GradientStop Color="#FF503468" Offset="1"/>
</LinearGradientBrush>
</Path.Stroke>
</Path>
<ContentPresenter x:Name="contentPresenter" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Width="9" Content="?" RenderTransformOrigin="0.5,0.5">
<ContentPresenter.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform/>
<TranslateTransform/>
</TransformGroup>
</ContentPresenter.RenderTransform>
</ContentPresenter>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsFocused" Value="True"/>
<Trigger Property="IsDefaulted" Value="True"/>
<Trigger Property="IsMouseOver" Value="True"/>
<Trigger Property="IsPressed" Value="True"/>
<Trigger Property="IsEnabled" Value="False"/>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Button Content="?" Style="{DynamicResource HelpBtn}" Width="27" Foreground="#FFFDF7F7" Height="22" d:LayoutOverrides="VerticalAlignment"/>