Dropdown multi-selection

Hello everyone, I have the following problem. When I use a dropdown list and allow multiple options, there are too many options in the small field. However, it is not possible to view the options because you cannot scroll or resize the window.

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My idea was to use two buttons and have them increase the size of the window on click and then decrease it again.

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However, when I click on them, the data type of width and height changes from value to array and creates two arrays. This is my code and this is how width and height look like.
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def runAction(self, event):
	self.getSibling("AAA").position.height = 100
	self.getSibling("AAA").position.width = 259,14

POSITION.height.auto

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