calling a parent window class method from a child window class

Hello,

I am working on a plot/chart display wxWidgets application in which I have 
in my main frame a child wxWindow for drawing the chart and a panel in 
which I have four text controls.
I can set the min and max range for the X and Y axes of my chart with the 
text controls but I have also implemented a mouse drag procedure to 
directly select an area on the chart to zoom into (this procedure uses 
mouse events in the chart window (child)).

What I would like to do is update the values displayed in the text controls 
when the chart axis ranges are modified by the mouse drag procedure. 

*QUESTION: *Is there anyway for a child window (the class being nested 
within the parent class) to call a parent window method directly?

it is my understanding that one solution would be to create a custom event 
in the child window that propagates to the parent which then handles it. 
But is there any other (simpler) way of doing this?

Thanks in advance!

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