How to map activex objects to zoom level of browser

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C++

ActiveX

I created a rectangle using a activex(internally using GDI concepts) plugin. But when I zoom the webpage in browser (using Ctrl+ mouse_scroll) the drawn rectangle remains as it is and only the web page gets zoomed. is there any way to map the drawn rectangle to map to browser zoom level..??
I dont want to write a new rectangle with new(zoomed) coordinates. I want the same rectangle drawn earlier to map with the page and expand/shrink along with the web page.