Thanks for your reply.
We want to learn the feature we care,
1.About "designer", I mean that,at first,we can define many customerize control according our requirement,and the control have the special begin element and end element,and when mouse focus move to the element field,the property grid will display, when we modify some value through property grid form,the code will update correspondingly.the question is, we can define the customerize control(for example, tree control,menu control,tab control, etc) ourself? the second question is, when mouse move to some field in the editor location in the begin element and end element, the property grid will display correspondingly and we can modify or set the property value,and the code will update or add to the corresponding field;just as vs.net.
2.how to select the customerize control automaticly when the mouse fucus move to the field within the customerize control so we can locate the control quickly.
3.not use as vs.net Add-on. will the editor support IntelliSense(IntelliPrompt) itself?
4.in the future, can we implement design function as vs.net? it is, as vs.net or dreamweaver,the up space is code, and the down space is the WYSIWYG designer.
if all the above 4 question can reach, what's the proposible workload and difficult? or you have other production more match our requirement?