Example

A simple panel you can open and close with a chat command.

@persist Frame:dframe

if(first()) {
    runOnChat(1)
    #add all players to the default list
    vguiDefaultPlayers(players())
    Frame = dframe(1)
    Frame:setSize(150,150)
    Frame:center()
    Frame:setVisible(0) #set invisible on create
    Frame:setDeleteOnClose(0) # only hides the panel when the close button is pressed
    Frame:makePopup()
    Frame:create()
}
if(chatClk()) {
    if(lastSaid()=="menu") {
        local Visible = Frame:isVisible(lastSpoke()) #get the current visible status for the player
        Frame:setVisible(!Visible) #inverse the status
        Frame:modify(array(lastSpoke())) #apply changes only to the player who executed the command
    }
}

A simple menu that shows to to interact with buttons.

@persist Main:dframe [Button Button2]:dbutton


if(first()) {
    runOnChat(1) runOnVgui(1)
    vguiDefaultPlayers(players())

    Main = dframe(1)
    Main:setTitle("Menu")
    Main:setPos(60,300)
    Main:setColor(255,120,120)
    Main:makePopup()
    Main:setDeleteOnClose(0)
    Main:enableKeyboardInput(0)
    Main:setVisible(0)
    Main:create()
    
    
    Button = dbutton(2,1)
    Button:setPos(15,25)
    Button:setText("Change Color")
    Button:setIcon("icon16/arrow_refresh.png")
    Button:setSize(110,40)
    Button:create()

    Button2 = dbutton(3,1)
    Button2:setPos(15,70)
    Button2:setText("Spawn Prop")
    Button2:setIcon("icon16/package_add.png")
    Button2:setSize(110,40)
    Button2:create()

}
if(chatClk()) {
    if(lastSaid() == "open") {
        Main:setVisible(!Main:isVisible(lastSpoke()))
        Main:modify(array(lastSpoke()))
    }
}
if(vguiClk()) {
    local ID = vguiClkPanelID()
    switch(ID) {
        case 2, #
            Main:setColor(randvec(0,255))
            Main:modify(array(vguiClkPlayer()))
        break
        case 3,
            local AimPos = vguiClkPlayer():aimPos()
            propSpawn("models/props_junk/cardboard_box001a.mdl",AimPos + vec(0,0,50),0)
        break
    }
}