<?xml version="1.0" encoding="utf-8" standalone="yes"?> <panel name="panel_im_control_panel"> <layout_stack name="vertical_stack"> <layout_panel name="call_btn_panel"> <button label="通話" name="call_btn"/> </layout_panel> <layout_panel name="end_call_btn_panel"> <button label="離開通話" name="end_call_btn"/> </layout_panel> <layout_panel name="voice_ctrls_btn_panel"> <button label="語音控制" name="voice_ctrls_btn"/> </layout_panel> </layout_stack> </panel>