How to programmatically resize a CEP panel

I've got this panel developed for After Effects, using CEP.

The panel default "snap-sizes" make it look very weird, so I want a control over panel's width and height.

Tried many ways like specifiying those values in the manifest.xml file:

      <UI>
        ...
        <Geometry>
          <Size>
            <Width>200</Width>
            <Height>400</Height>
          </Size>
          <MaxSize>
            <Width>200</Width>
            <Height>400</Height>
          </MaxSize>
          <MinSize>
            <Width>200</Width>
            <Height>400</Height>
          </MinSize>
        </Geometry>
         ...
      </UI>

In addition, tried using this function:

window.resizeTo(200, 400);

which after searching online found that it won't affect chromuim-based applications...

Also that function:

new CSInterface().resizeContent(200, 400);

 which also doesn't do anything...

Also found this dead-end discussion - how to resize panel extensions 

Unfortunately, nothing make it work...

I do know that you do able to specifiy snap sizes when developing plugins using the C++ sdk as follows:

void BasePanelUI::GetSnapSizes(A_LPoint *snapSizes, A_long *numSizesP)
{
    snapSizes[0].x = 205;
    snapSizes[0].y = 100;
    snapSizes[1].x = 205;
    snapSizes[1].y = 400;
    *numSizesP = 2;
}

Is there a way to do that when using CEP?