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Cast variable or string as member function

Is there a way to use a variable, string, array key, etc., as a member function? Here's an example:

screen = CreateObject("roGridScreen")

' Assign the member function names to the array keys,
' and their respective values the array values.
gridAA = {
"SetDisplayMode": "scale-to-fill",
"SetGridStyle": "Flat-Movie"

' Issue is right here:
for each gridFunc in gridAA
gridVar = gridAA[gridFunc]

As it's written this code is interpreting screen.gridFunc(gridVar) literally (which obviously won't work), so is there a way to cast gridFunc(gridVar) as a member function so that it can be called by screen (which in this case is an roGridScreen object)?
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