Can't raise click event of a UserControl in C# -

i have dynamically added usercontrol:

var listitem = new listitem(/* arguments */); listitem.click += setlistitemcolor;  panel.controls.add(listitem); // "panel" flowlayoutpanel 

setlistitemcolor:

private void setlistitemcolor(object sender, eventargs e) {     var listitem = (listitem)sender;     if (listitem.backcolor == color.lightgray)     {         listitem.backcolor = color.white;     }     else     {         listitem.backcolor = color.lightgray;     } } 

no change color happens when click on usercontrol. however, test purpose, tried change event enabledchangedand change enabled property, color change:

var listitem = new listitem(/* arguments */); listitem.enabled = false; listitem.enabledchanged += setlistitemcolor; listitem.enabled = true;  panel.controls.add(listitem); 

what's problem?

edit: since docking doesn't work in flowlayoutpanel, suggest setting size of control size of panel. set listitem margins empty below maximum fill. debugging set backcolor different make sure can see it:

        var listitem = new listitem(/* arguments */);         listitem.backcolor = color.yellow; // debugging         listitem.margin = padding.empty;         listitem.size = panel.size;         listitem.click += setlistitemcolor; 

note if control resized need resize listitem again.