Can we change the behaviour of PopUp Anchor component?

Hi,
I have a datagrid. I am using an item renderer in one of its column to display a button. On the click of the button, I use a pop anchor component to open a pop up window below the selected row.
Now My Problem is the fact that the the popup anchor opens the popup above the row as not does not find space below. My question is :
1) How can I change this behaviour to ensure that popup anchor can increase the size to accomadte the pop up being opened? I am sure this require changes in PopUp anchor class but I am not sure how best to acheive it.
2) Since pop is virtually part of the grid , can we effect change in size of the grid if the pop up is being opened at few bottom rows and it does not find enough space.

Actually I want to increase the screen size such that the browser scroll also expands and the pop up shows up and when the popup closes resizing happens.
Can you help me with some code samples of how to effect the above requirement?

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