Combox结合checkbox选框，下拉

Combox结合checkbox选框，下拉

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Reflection;

namespace PresentationControls
{
    /// 

    /// Martin Lottering : 2007-10-27
    /// --------------------------------
    /// This is a usefull control in Filters. Allows you to save space and can replace a Grouped Box of CheckBoxes.
    /// Currently used on the TasksFilter for TaskStatusses which means the user can select which Statusses to include
    /// in the “Search“.
    /// This control does not implement a CheckBoxListBox instead it adds a wrapper for the normal ComboBox and Items. 
    /// See the CheckBoxItems property.
    /// ----------------
    /// ALSO

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2007-11-23 10:50  DemoApp\bin\
     目录           0  2007-11-23 10:50  DemoApp\bin\Debug\
     文件       33792  2007-11-23 11:01  DemoApp\bin\Debug\CheckBoxComboBox.dll
     文件       12800  2007-11-23 11:10  DemoApp\bin\Debug\DemoApp.exe
     文件         473  2007-02-22 07:51  DemoApp\bin\Debug\DemoApp.vshost.exe.manifest
     文件         454  2007-11-09 00:12  DemoApp\DataTableWrappers.cs
     文件        3905  2007-11-08 11:13  DemoApp\DemoApp.csproj
     文件        3127  2007-11-23 11:10  DemoApp\Form1.cs
     文件        8095  2007-11-23 11:10  DemoApp\Form1.Designer.cs
     文件        5814  2007-11-23 11:10  DemoApp\Form1.resx
     文件         499  2007-10-28 02:27  DemoApp\Program.cs
     目录           0  2007-11-23 10:50  DemoApp\Properties\
     文件        1430  2007-10-28 02:27  DemoApp\Properties\AssemblyInfo.cs
     文件        2843  2007-10-28 02:27  DemoApp\Properties\Resources.Designer.cs
     文件        5612  2007-10-28 02:27  DemoApp\Properties\Resources.resx
     文件        1092  2007-10-28 02:27  DemoApp\Properties\Settings.Designer.cs
     文件         249  2007-10-28 02:27  DemoApp\Properties\Settings.settings
     文件        1064  2007-11-09 00:56  DemoApp\Statusses.cs
     目录           0  2007-11-23 11:10  DemoApp\
     文件        1423  2007-10-28 02:28  CheckBoxComboBox.sln
     目录           0  2007-11-23 10:50  CheckBoxComboBox\bin\
     目录           0  2007-11-23 10:50  CheckBoxComboBox\bin\Debug\
     文件       33792  2007-11-23 11:01  CheckBoxComboBox\bin\Debug\CheckBoxComboBox.dll
     文件       27999  2007-11-23 11:01  CheckBoxComboBox\CheckBoxComboBox.cs
     文件        3445  2007-11-09 00:16  CheckBoxComboBox\CheckBoxComboBox.csproj
     文件         168  2007-10-28 02:28  CheckBoxComboBox\CheckBoxComboBox.csproj.user
     文件        1080  2007-10-28 03:41  CheckBoxComboBox\CheckBoxComboBox.Designer.cs
     文件        3072  2007-10-28 03:41  CheckBoxComboBox\GripBounds.cs
     文件        1877  2007-10-28 03:41  CheckBoxComboBox\NativeMethods.cs
     文件       20546  2007-11-07 08:00  CheckBoxComboBox\Popup.cs
     文件        1349  2007-10-28 03:35  CheckBoxComboBox\Popup.Designer.cs
............此处省略10个文件信息