Button in one panel and when clicked draw a line in another panel

I am new to wxpython so please bare with me for this potential easy (silly) question: I have two panels in the frame, and I placed a button in one panel, and I need to draw a line in the other panel when the button is clicked. How can I achieve that?

This is the codes I have for now, which can draw a line in the same panel where the button is located. How to change the codes so the line show up in the gray panel? Thanks!

import wx

class myButton(wx.Button):
    def __init__(self, parent, id, label, pos):
        super().__init__(parent, id, label, pos)
        self.Bind(wx.EVT_BUTTON, self.on_btn_click)

    def on_btn_click(self, e):
        print(f"Button is clicked.")
        hline = wx.StaticLine(self.GetParent(),
                              pos=(20, 100),
                              size=wx.Size(50, 3))

class myPanelA(wx.Panel):
    def __init__(self, parent, id=wx.ID_ANY,
                 pos=(0, 0),
                 size=wx.Size(200, 500)):
        super(myPanelA, self).__init__(parent, id, pos, size)

        btn = myButton(self, id=wx.ID_ANY, label="button", pos=(20, 200))

class myPanelB(wx.Panel):
    def __init__(self, parent, id=wx.ID_ANY,
                 pos=(200, 0),
                 size=wx.Size(1500, 500)):
        super(myPanelB, self).__init__(parent, id, pos, size)

class myFrame(wx.Frame):
    def __init__(self, parent):
        wx.Frame.__init__(self, parent)
        self.SetSize((1500, 500))
        self.panel_a = myPanelA(self)

        self.panel_b = myPanelB(self)

def main():
    app =wx.App()
    frame = myFrame(None)

if __name__ == '__main__':

The usual way to do this is to do the binding and implementing of the button’s event handler in the frame class, rather than doing it in a sub-class of wxButton.

Having the event handler in the frame class you can then easily access the other controls, using the instance attributes self.panel_a, self.panel_b, etc.

Thank you Richard. This is very helpful.