/// <summary>
/// 删除所有元素
/// </summary>
private void SelectedElementRemoveAll()
{
if (SelectedElements == null || SelectedElements.Count == 0)
{
return;
}
for (int i = SelectedElements.Count - 1; i >= 0; i--)
{
((IControlBase)SelectedElements[i]).SetUnFocus();
SelectedElements.RemoveAt(i);
}
}