void DisposeFreeControls()
{
if (this.tabControl_main != null && Program.MainForm != null)
{
// 如果当前固定面板拥有 tabControl_main，则要先解除它的拥有关系，否则怕本 Form 摧毁的时候无法 Dispose() 它
if (Program.MainForm.CurrentPropertyControl == this.tabControl_main)
{
Program.MainForm.CurrentPropertyControl = null;
}
}
ControlExtention.DisposeFreeControls(_freeControls);
}
void DisposeFreeControls()
{
ControlExtention.DisposeFreeControls(_freeControls);
}