shrinking radcombox

[Jols]

hello to all
   
                 good day,

                 i'm having difficulties on maintaining the width for my radcombox the browser, when i run it to IE 7 the radcombox is shrinking to about 2px size/width, his width define is 50px, i tried to view it in mozilla firefox its stand on his original size of 50px. what i gonna do to view it in IE browser to its size define to 50px that will not shrink..sample codes is highly appreciated

thanks