WPF ToggleButton incorrect render behavior - wpf

Question

What is going on here, and how to do a workaround?
Press MyToggleButton. Now it looks like instantly pressed (checked).
At the same time MyToggleButton_Checked handler disables the MyToggleButton.
Now press non-toggle Button 'Enable'. What we see? The MyToggleButton looks like it is enabled. OK. But wait, now it looks like non-pressed! Why?!
XAML:
<StackPanel>
<ToggleButton x:Name="MyToggleButton" Content="MyToggleButton" Checked="MyToggleButton_Checked"/>
<TextBlock Text="{Binding IsChecked, ElementName=MyToggleButton}" Margin="0,4"/>
<Button Name="EnableButton" Content="Enable" Click="EnableButton_Click"/>
<Button Name="DisableButton" Content="Disable" Click="DisableButton_Click"/>
</StackPanel>
Code-behind:
void MyToggleButton_Checked(object sender, RoutedEventArgs e)
{
MyToggleButton.IsEnabled = false;
}
void EnableButton_Click(object sender, RoutedEventArgs e)
{
MyToggleButton.IsEnabled = true;
}
void DisableButton_Click(object sender, RoutedEventArgs e)
{
MyToggleButton.IsEnabled = false;
}
UPD:
The only possible workaround on the moment is:
void EnableButton_Click(object sender, RoutedEventArgs e)
{
MyToggleButton.IsEnabled = true;
var controlTemplate = MyToggleButton.Template;
var buttonChrome = (Microsoft.Windows.Themes.ButtonChrome)controlTemplate.FindName("Chrome", MyToggleButton);
buttonChrome.RenderPressed = false;
buttonChrome.RenderPressed = true;
}
Are there any others?
UPD2:
Another workaround is:
void EnableButton_Click(object sender, RoutedEventArgs e)
{
MyToggleButton.IsEnabled = true;
var controlTemplate = MyToggleButton.Template;
MyToggleButton.Template = null;
MyToggleButton.Template = controlTemplate;
}
But the control is flickering at the moment of template substitution.

Answer 1

That's my solution for the problem, here is the video, the usage:
<StackPanel>
<ToggleButton x:Name="MyToggleButton" Content="MyToggleButton" Checked="MyToggleButton_Checked"
l:CorrectToggleButtonCheckedEnableBehavior.IsActive="True"/>
<Button Name="EnableButton" Content="Enable" Click="EnableButton_Click"/>
</StackPanel>
and the attached behavior source code:
public static class CorrectToggleButtonCheckedEnableBehavior
{
public static bool GetIsActive(ToggleButton toggleButton)
{
return (bool)toggleButton.GetValue(IsActiveProperty);
}
public static void SetIsActive(ToggleButton toggleButton, bool value)
{
toggleButton.SetValue(IsActiveProperty, value);
}
public static readonly DependencyProperty IsActiveProperty =
DependencyProperty.RegisterAttached("IsActive", typeof(bool), typeof(CorrectToggleButtonCheckedEnableBehavior),
new UIPropertyMetadata(false, OnIsActiveChanged));
static void OnIsActiveChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var toggleButton = (ToggleButton)d;
if (GetIsActive(toggleButton))
{
toggleButton.IsEnabledChanged += new DependencyPropertyChangedEventHandler(ToggleButton_IsEnabledChanged);
}
else
{
toggleButton.IsEnabledChanged -= new DependencyPropertyChangedEventHandler(ToggleButton_IsEnabledChanged);
}
}
static void ToggleButton_IsEnabledChanged(object sender, DependencyPropertyChangedEventArgs e)
{
var toggleButton = (ToggleButton)sender;
if (toggleButton.IsEnabled && (toggleButton.IsChecked ?? false))
{
Invalidate(toggleButton);
}
}
static void Invalidate(ToggleButton toggleButton)
{
var controlTemplate = toggleButton.Template;
toggleButton.Template = null;
toggleButton.Template = controlTemplate;
}
}