design issue in chrome browser alone

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ASP.NET

HTML

Telerik

chrome

telerik rad window has rad window inside here inside parent rad window contents gets expanded / collopsed when expanded or when a child rad window opens their is empty space created at the bottom of the page also the parent rad window showing page has asp.net master page like footer, header etc . i increased margin top it controlled the issue to some extent only. This occurs only in chrome browser