How to filter the Entity wise Document Templates based on "Associated Entity Type Code"

Hello all,

I have situation, where I need to present the dialog to user to choose from available Document Templates for a entity.

I want to know how to filter the Document templates based for the related entity i.e. based on the filed "Associated Entity Type Code" in CRM Dialog. Through code, I am able to do this, but I don't want to build a external web page for displaying the Document templates to choose one template.

Please suggest a way to do filter the Document templates.

Thanks

Meenxip