wpf - Dependency Property doesnt trigger -

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i have problem dependency properties. have been searching quite while "how tos" nothing me far.

i need grid change background color when drag it. here code far:

vb

friend shared readonly isdragoverpropertykey dependencypropertykey = dependencyproperty.registerreadonly("isdragover", gettype(boolean), _                                                                                                       gettype(ucpagecontrol), _                                                                                                       new propertymetadata(false))   public shared readonly isdragoverproperty dependencyproperty = isdragoverpropertykey.dependencyproperty  private _isdragover boolean = true public property isdragover() boolean             return cbool(getvalue(isdragoverproperty))     end     set(byval value boolean)         setvalue(isdragoverproperty, value)     end set end property  private sub grid_dragenter(sender object, e windows.drageventargs)     isdragover = true end sub   private sub grid_dragleave(sender object, e windows.drageventargs)     isdragover = false end sub

xaml

 <grid margin="0,0,216,63" dragenter="grid_dragenter" dragleave="grid_dragleave" mouseenter="grid_mouseenter_1" mouseleave="grid_mouseleave_1" allowdrop="true" >     <grid.rowdefinitions>         <rowdefinition></rowdefinition>     </grid.rowdefinitions>     <grid.style>         <style targettype="grid">             <style.triggers>                 <trigger property="elements:ucpagecontrol.isdragover" value="false">                     <setter property="background" value="white"></setter>                 </trigger>                 <trigger property="elements:ucpagecontrol.isdragover" value="true">                     <setter property="background" value="black"></setter>                 </trigger>             </style.triggers>         </style>     </grid.style> </grid>

somehow grid doesnt realize when property changes. here help?

create new class inherites grid , contains dependancy property. , use in xaml.

<controls:mygrid margin="0,0,216,63" dragenter="grid_dragenter" dragleave="grid_dragleave" mouseenter="grid_mouseenter_1" mouseleave="grid_mouseleave_1" allowdrop="true" >     <controls:mygrid.rowdefinitions>         <rowdefinition></rowdefinition>     </controls:mygrid.rowdefinitions>     <controls:mygrid.style>         <style targettype="controls:mygrid">             <style.triggers>                 <trigger property="isdragover" value="false">                     <setter property="background" value="white"></setter>                 </trigger>                 <trigger property="isdragover" value="true">                     <setter property="background" value="black"></setter>                 </trigger>             </style.triggers>         </style>     </controls:mygrid.style>  </controls:mygrid>

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