wpf - Visual Studio - How to handle Project Property Changes -

i have usercontrol has read string (an url) file at design time. made vspackage exposes menu command in visual studio ide; clicking on command user able provide url via wpf window , save value file pressing ok.

the usercontrol reads file on controlloaded event , gets url property. now...if user changes url value again using vspackage window, how can intercept property change? there way access vspackage properties usercontrol code?

thanks