WPF button takes two clicks to fire Click event

Question

I have a TabItem which contains a calendar control and a button. The issue is that when the calendar\'s selected date is the same as the previously selected date, the button tak

Answer 1

This was the best answer I found on the web. It's still not perfect because it doesn't help with buttons that are marked as IsDefault or IsCancel

protected override void OnPreviewMouseUp(MouseButtonEventArgs e)
{
  base.OnPreviewMouseUp(e);
  if (Mouse.Captured is Calendar || Mouse.Captured is System.Windows.Controls.Primitives.CalendarItem)
  {
    Mouse.Capture(null);
  }
}