How to set active document editable when userform is opened?

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macros

VBA

I have created userform, If I open userform,am unable to edit in the active document with the userform opened. For example: If we press ctrl+f,the find functionality dialog box will be displayed,by keeping that dialog box opened we can scroll,edit etc in the active document.How to do it? Now its like, if alert message is displayed,we can't to do anything in active document until we close that alert message. I don't need like that. I need to handle both userform and active document simultaneously.

Thanks in advance.