dlg1 = Dialog {
    id = "dlg1",
    title = "First Dialog",
    parent=nil,
    onclose = function()
        dlg1:modify{ id="dlg1_close_fit",  visible = true }
    end
}
dlg1:label { id = "dlg1_close_fit", text = "!!!!!!!!!!!!!!", visible=false }

dlg1:button{ id="dlg1_button", label="Dialog 2:", text="Show", onclick=function()
    dlg2 = Dialog {
        id = "dlg2",
        title = "Dialog",
        onclose = function()
            dlg2:modify{ id="dlg2_close_fit",  visible = true }
        end
    }
    dlg2:label { id = "dlg2_close_fit", text = "!!!!!!!!!!!!!!", visible=false }
    dlg2:button{ id= "exit", text = "Exit", onclick=function()
        app.command.Exit()
    end}
    dlg2:show{}
end}

dlg1:show {}