[Closed] How to add a new button by clicking an existed button

you would have to create a dynamic UI… you can either…

A. Use maxscript UI elements
in which case you’ll have to either…
A.a Build the rollout, as a string, yourself – then evaluate that string and open that new rollout to update your UI
A.b Use the RolloutCreator (see help file) to help you build the rollout and open that new rollout to update your UI

basic example:

global roll_buttons
global build_rollout

fn addAnotherButton = (
	roll_buttons_count += 1
	counter = roll_buttons_count as string
	roll_buttons += "button btn_" + counter + " \"Button " + counter + "\"
"
)
roll_header = "
	rollout roll_test \"test\" (
		button btn_test \"test\"
		on btn_test pressed do (
			destroyDialog roll_test
			addAnotherButton()
			createDialog (buildRollout())
		)
"
roll_footer = "
		label lbl_test \"test\"
	)
"
roll_buttons = ""
roll_buttons_count = 0

fn buildRollout = (
	execute (roll_header + roll_buttons + roll_footer)
)
createDialog (buildRollout())

B. Use .NET
.NET gives you the advantage of adding buttons to a UI without having to close/re-open that UI. The disadvantage is that these buttons -have- to be .NET buttons, within a .NET form or other .NET-controls-capable .NET control (e.g. a tab), onto which you cannot place any MaxScript controls.

rollout roll_test "test" width:220 height:220 (
	dotNetControl dnc_panel "Windows.Forms.Panel" width:200 height:200

	local numButtons = 0
	fn clickFunc sender args = (
		numButtons += 1
		local newButton = (dotNetObject "Windows.Forms.Button")
		newButton.text = "Button " + numButtons as string
		newButton.top = 24 * numButtons
		dnc_panel.controls.add newButton
	)
	on roll_test open do (
		dnc_panel.autoScroll = true -- in case of many buttons
		local firstButton = (dotNetObject "Windows.Forms.Button")
		firstButton.text = "Hello"
		dnc_panel.controls.add firstButton
		dotNet.addEventHandler firstButton "click" clickfunc
	)
)
createDialog roll_test

You’re so kindhearted.
I’m reading your MAXScript and trying to get it.
Thanks a lot!