Panda3D Manual: DirectOptionMenu
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The DirectOptionMenu class models a popup menu with an arbitrary number of items. It is composed of the menu bar, the popup marker, and the popup menu itself. The popup menu appears when the menu is clicked on and disappears when the user clicks again; if the click was inside the popup, the selection changes. By default, the text on the menu changes to whatever item is currently selected. The attributes that affect the appearance of the menu bar don't apply to the popup. Make sure to specify the items option or it may crash.
Keyword | Definition | Value
textMayChange | Whether the text on the menu changes with the selection | 0 or 1
initialitem | The index of the item that appears next to the cursor when the popup appears | Number
items | List of items in the popup menu | [Strings]
command | Function called when an item is selected (the item is passed in as a parameter) | Function
commandButtons | Which mouse button must be clicked to open the popup | LMB, MMB, or RMB
extraArgs | Extra arguments to the function specified in command | [Extra Arguments]
highlightColor | Color of highlighted text | (R,G,B,A)
rolloverSound | The sound made when the cursor rolls over the button | Sound File Path
clickSound | The sound made when the cursor clicks on the button | Sound File Path
popupMarkerBorder | Use width to change the size of the border around the popup marker | (Width,Height)
## Example
    import direct.directbase.DirectStart
    from direct.gui.OnscreenText import OnscreenText
    from direct.gui.DirectGui import *

    #add some text
    bk_text = "DirectOptionMenu Demo"
    textObject = OnscreenText(text = bk_text, pos = (0.85,0.85),
    scale = 0.07,fg=(1,0.5,0.5,1),align=TextNode.ACenter,mayChange=1)

    #add some text
    output = ""
    textObject = OnscreenText(text = output, pos = (0.95,-0.95),
     scale = 0.07,fg=(1,0.5,0.5,1),align=TextNode.ACenter,mayChange=1)

    #callback function to set  text
    def itemSel(arg):
    	output = "Item Selected is: "+arg
    	textObject.setText(output)

    #create a frame
    menu = DirectOptionMenu(text="options", scale=0.1,items=["item1","item2","item3"],initialitem=2,
    highlightColor=(0.65,0.65,0.65,1),command=itemSel)

    #run the tutorial
    run()
This is a simple demonstration of the DirectOptionMenu. ## Dynamic Updating of a Menu
    import direct.directbase.DirectStart
    from direct.gui.OnscreenText import OnscreenText
    from direct.gui.DirectGui import *

    #add some text
    bk_text = "DirectOptionMenu Demo"
    textObject = OnscreenText(text = bk_text, pos = (0.85,0.85),
    scale = 0.07,fg=(1,0.5,0.5,1),align=TextNode.ACenter,mayChange=1)

    #add some text
    output = ""
    textObject = OnscreenText(text = output, pos = (0.95,-0.95),
    scale = 0.07,fg=(1,0.5,0.5,1),align=TextNode.ACenter,mayChange=1)

    #callback function to set  text
    def itemSel(arg):
    	if(arg != "Add"): #no need to add an element
    		output = "Item Selected is: "+arg
    		textObject.setText(output)
    	else: #add an element
    		tmp_menu = menu['items']
    		new_item = "item"+str(len(tmp_menu))
    		tmp_menu.insert(-1,new_item) #add the element before add
    		menu['items'] = tmp_menu
    		#set the status message
    		output = "Item Added is: "+new_item
    		textObject.setText(output)

    #create a frame
    menu = DirectOptionMenu(text="options", scale=0.1,items=["item1","item2","item3","Add"],
    initialitem=2,highlightColor=(0.65,0.65,0.65,1),command=itemSel,textMayChange=1)

    #run the tutorial
    run()
In this example we add an item to the menu whenever the Add item is selected.
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