Adam:

 

Try the following code:

   System.Web.UI.WebControls.Image Image2 = new System.Web.UI.WebControls.Image();
   Image2.ToolTip    = "Using oncommand";
   Image2.ImageUrl    = "tools.gif";
   Image2.CssClass    = "CuteEditorButton";
   SetMouseEvents(Image2);
   tc.Control.Controls.Add(Image2);

 

 void SetMouseEvents(WebControl control)
 {
     control.Attributes["onmouseover"]="CuteEditor_ButtonCommandOver(this)";
     control.Attributes["onmouseout"]="CuteEditor_ButtonCommandOut(this)";
     control.Attributes["onmousedown"]="CuteEditor_ButtonCommandDown(this)";
     control.Attributes["onmouseup"]="CuteEditor_ButtonCommandUp(this)";
     control.Attributes["ondragstart"]="CuteEditor_CancelEvent()";
 }