private void toggleButton_Loaded(object sender, RoutedEventArgs e)
{
//查找默认三角区域的容器
ToggleButtonBoreder = ExpandToggleButton.FindVisualChild <Border>();
if (ToggleButtonBoreder != null)
{
//需要设置所有父容器的对齐，因为设置为物理像素对齐后，默认对齐为，左 上
ExpandToggleButton.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
ExpandToggleButton.VerticalAlignment = System.Windows.VerticalAlignment.Top;
//手动设置居中
//toggleButton.Margin = new Thickness(4, 4, 0, 0);
//取消默认的Border的边框，使其可以手动计算位置
ToggleButtonBoreder.Padding = new Thickness(0);
ToggleButtonBoreder.BorderThickness = new Thickness(0);
//设置图片显示的宽高，跟实际图片大小相同，保证图片正常显示
ToggleButtonBoreder.Width = 9;
ToggleButtonBoreder.Height = 9;
ToggleButtonBoreder.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
ToggleButtonBoreder.VerticalAlignment = System.Windows.VerticalAlignment.Top;
//取消默认的三角形显示
ToggleButtonBoreder.Child = null;
//设置新的背景
SetMouseUnOverImage();
}
}
