private void barButtonItem4_ItemClick(object sender, ItemClickEventArgs e) {
Desktop dt = new Desktop();
dt.PlatForm = this;
this.showControl(dt, null).Text = "我的桌面";
}
void ContentClick(object obj, EventArgs e) {
Desktop dt = new Desktop();
dt.PlatForm = this;
this.showControl(dt, null).Text = "我的桌面";
}