WindowsFormsHost in RadRibbonDropDownButton

[László]

   Hi,

Can anybody help on how to use WindowsFormsHost in RadRibbonDropDownButton DropDownContent.
I copied the RadRibbonDropDownButton style, change the popup AllowsTransparency to false (as a known issue for WindowsFormsHost in popup) and set the new style for my RadRibbonDropDownButton, but it is still not show the winforms control.
Something still "block" it, but I did not find.
Please help! Thanks!

   Lacka

[Kiril Vandov]

Hello Lacka,

The RadRibbonDropDownButton's popup is internally wrapped in our custom popup-wrapper which changes the AllowsTransparency property to true. That is why when you change the default style your change is overridden afterwords.
As a workaround you could listen for the loaded event of the button and set the button popup AllowsTransparency to false, like follow:

private void button_Loaded(object sender, RoutedEventArgs e)
{
    var button = sender as RadRibbonDropDownButton;
    if (button != null)
    {
        var popup = button.FindChildByType<Popup>();
        if (popup != null)
        {
            popup.AllowsTransparency = false;
        }
    }
}

Doing so you do not need to override the default style.

I hope this information helps.

Kind regards,
Kiril Vandov
Telerik