/// <summary>
/// The event handler that is listening to the preview invoke event that is fired by
/// the trigger. Setting PreviewInvokeEventArgs.Cancelling to True will
/// cancel the invocation.
/// </summary>
/// <param name="sender">The trigger base object.</param>
/// <param name="e">An object of type PreviewInvokeEventArgs where e.Cancelling can be set to True.</param>
private void OnPreviewInvoke(object sender, PreviewInvokeEventArgs e)
{
if (this.Condition != null)
{
e.Cancelling = !this.Condition.Evaluate();
}
}
void OnPreviewInvoke(object sender, PreviewInvokeEventArgs e)
{
DataBindingHelper.EnsureDataBindingOnActionsUpToDate(this);
}