You have several options to show what tag or classification has been selected to filter the items.
2. Another option is to bind the control template. This could be done from the Widget -> Edit -> Advanced -> LayoutTemplatePath and in the codebehind of the .ascx in PageLoad to check if it is a postback and to evaluate the Url and set the value to a ASP label or other control.
3. You can make a custom widget, which inherits from the default one - TaxonomyControl and add you own custom logic.
These are only a suggestions. Feel free to choose the way you achieve your desired scenario.
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