问一个关于ToolStripDropDown焦点的问题
照着msdn做一个自定义的comboxTreeView,代码如下：
public class MyCombo : textbox
{
ToolStripControlHost treeViewHost;
ToolStripDropDown dropDown;
public MyCombo()
{
TreeView treeView = new TreeView();
treeView.BorderStyle = BorderStyle.None;
treeViewHost = new ToolStripControlHost(treeView);
dropDown = new ToolStripDropDown();
dropDown.Items.Add(treeViewHost);
this.GotFocus += new EventHandler(MyCombo_GotFocus)
}
public TreeView TreeView
{
get { return treeViewHost.Control as TreeView; }
}
private void ShowDropDown()
{
if (dropDown != null)
{
treeViewHost.Width = DropDownWidth;
treeViewHost.Height = DropDownHeight;
dropDown.Show(this, 0, this.Height);
}
}
void MyCombo_GotFocus(object sender, EventArgs e)
{
ShowDropDown();
return;
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (dropDown != null)
{
dropDown.Dispose();
dropDown = null;
}
}
base.Dispose(disposing);
}
}
}
因为我想在textbox获得焦点时，让dropdown显示，结果是dropdown显示了，但是焦点却不见了。请问如何使dropDown显示的时候，焦点还是在原来的控件那？
[解决办法]
