plugin window size

Hi All,
I have a plugin running a Chat in an iframe via a _webView, displayed inside a customFrame. 
I'd like to configure the default size of the window displaying the plugin.

Problem is:

a. customFrame.Width and customFrame.Height are read-only.
b. _webView.Width and _webView.Height control only the inner iframe content, not the overall window size.

Is it possible:

1. To configure the size of the customFrame at the window level?
2. If not, is it possible to create a button to dynamically adjust the window size?

_webView = new WebView();
var customFrame = ChartManager.AddCustomFrame("My Lovly Chat");
customFrame.Child = _webView;
customFrame.ChartContainer.Mode = ChartMode.Multi;
customFrame.Width =  some_size;
customFrame.Height = some_size;
_webView.Width = some_size;
_webView.Height = some_size;

Thanks!