silverlight - How to change the state of a checkbox by checking another checkbox in Microsoft Lightswitch -

i experimenting desktop app built microsoft lightswitch (currently working vs2013). have 1 screen "contacts" various controls , option hide contact (instead of deleting in case of future "resurrection"). respectively have screen hidden contacts.

what interests me how change value of 1 checkbox on screen based on value of checkbox?

so when set "hidden" true, "billing active" , "customer reporting" automatically set false.

what have far following:

    partial void contact_changed()     {         // write code here.         this.findcontrol("hidden").controlavailable += customer_hidden;         this.setdisplaynamefromentity(this.customer);     }      private void customer_hidden(object sender, controlavailableeventargs e)     {         checkbox p = e.control checkbox;         bool ap = p.ischecked.value;         //bool p = system.convert.toboolean(e);         switch (ap)         {             case true:                 this.findcontrol("contractactive").isvisible = false;                 break;              case false:                 this.findcontrol("contractactive").isvisible = true;                 break;         }     } 

the name of "billing active" checkbox "contractactive"

and not accomplish anything. whole purpose of thing sort of validation, i.e. once rid of someone, don't forget exclude him else :) display modal window popup warning or something, first interested in perhaps trivial problem.

thanks in advance!

edit: found how control checkboxes when on same screen:

    partial void customerdetail_created()         {             dispatchers.main.begininvoke(() => ((inotifypropertychanged)this.customer).propertychanged += propertychanged);     }      private void propertychanged(object sender, propertychangedeventargs e)     {         switch (customer.hidden)         {             case true:                 this.customer.hidden = true;                 this.customer.billingactive = false;                 break;              case false:                 this.customer.hidden = false;                 this.customer.billingactive = true;                 break;         }     } 

but if want change value of checkbox/other control in screen? partially works, if use same approach, screen 'triggers' change not saved (or appears not save).

not sure event have use / gets fired, when checking/unchecking checkbox top of head. but, in case should not work on controls , sure not on visibility. should more work on values of current item change those. try this:

contacts.selecteditem.billingactive = false; 

kind regards simon