c# - comboBox with checkList -

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how can combobox checklist in in c#?

i've been messing around myself. here's small sample of control has real checkboxes in rather drawing them. way can use checkbox class has offer. replaces regular drop down of combobox custom 1 inherites toolstripdropdownmenu allows add actual controls , solves problem of drop down closing whenever click on item. want extend mycombobox class quite bit fit needs, should place start.

public partial class form1 : form {     public form1()     {         initializecomponent();         var mcb = new mycombobox() { left = 6, top = 6 };         this.controls.add(mcb);          (int = 0; < 20; i++)         {             mcb.additem("item " + i.tostring() );         }     } }  public class mycombobox : combobox {     private mydropdown _dropdown;      public mycombobox()     {         _dropdown = new mydropdown() { width = 200, height = 200 };     }      public void additem(string text)     {         _dropdown.addcontrol(new checkbox() { text = text });     }      public void showdropdown()     {         if (_dropdown != null)         {             _dropdown.show(this);         }     }      protected override void wndproc(ref message m)     {         if (m.msg == wndui.wm_reflect + wndui.wm_command)         {             if (wndui.hiword(m.wparam) == wndui.cbn_dropdown)             {                 showdropdown();                 return;             }         }         base.wndproc(ref m);     } }  [toolboxitem(false)] public class mydropdown : toolstripdropdownmenu {     public mydropdown()     {         this.showimagemargin = this.showcheckmargin = false;         this.autosize = false;         this.doublebuffered = true;         this.padding = margin = padding.empty;     }      public int addcontrol(control control)     {         var host = new toolstripcontrolhost(control);         host.padding = host.margin = padding.empty;         host.backcolor = color.transparent;         return this.items.add(host);     }      public void show(control control)     {         rectangle area = control.clientrectangle;         point location = control.pointtoscreen(new point(area.left, area.top + area.height));         location = control.pointtoclient(location);         show(control, location, toolstripdropdowndirection.belowright);         this.focus();     } }  public static class wndui {     public const int         wm_user = 0x0400,         wm_reflect = wm_user + 0x1c00,         wm_command = 0x0111,         cbn_dropdown = 7;      public static int hiword(intptr n)     {         return hiword(unchecked((int)(long)n));     }      public static int hiword(int n)     {         return (n >> 16) & 0xffff;     } }

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