public CheckComboBox()
{
this.DrawMode = DrawMode.OwnerDrawFixed;//只有设置这个属性为OwnerDrawFixed才可能让重画起作用
lst.Width = ListWidth == 0 ? this.Width : ListWidth;
//lst.Height = ListHeight == 0 ? 300 : ListHeight;
lst.CheckBoxes = true;
lst.ShowLines = false;
lst.ShowPlusMinus = false;
lst.ShowRootLines = false;
lst.KeyUp += new KeyEventHandler(lst_KeyUp);
lst.AfterCheck += new TreeViewEventHandler(lst_AfterCheck);
this.DropDownHeight = 1;
frmhost = new PopupForm(lst);
//frmhost.Closed += new ToolStripDropDownClosedEventHandler(frmhost_Closed);
//frmhost.Opened += new EventHandler(frmhost_Opened);
}
private void SetOwnerItem(Control control)
{
if (control == null)
{
return;
}
if (control is PopupForm)
{
PopupForm popupControl = control as PopupForm;
ownerPopup = popupControl;
ownerPopup.childPopup = this;
OwnerItem = popupControl.Items[0];
return;
}
if (control.Parent != null)
{
SetOwnerItem(control.Parent);
}
}