public CheckComboBox() : base() { m_checkListBox = new CheckListBox(); m_checkListBox.Dock = DockStyle.Fill; m_checkListBox.ItemChecked += new ItemCheckedEventHandler(m_checkListBox_ItemChecked); m_dropDown = new ToolStripDropDown(); m_dropDown.Margin = new Padding(0); m_dropDown.Padding = new Padding(1); m_dropDown.Items.Add(new ToolStripControlHost(m_checkListBox)); m_dropDown.Closing += new ToolStripDropDownClosingEventHandler(m_dropDown_Closing); }