App.XML in one project referenced to other window app is ignored

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WPF

C#3.5

Hi, i made one project with type window app, so it has app.xml

i put application resource dictionary in it

App.XML in Project 1 with button style FontWeight Bold and Foreground Red

<Application.Resources>
    <ResourceDictionary>
	<ResourceDictionary.MergedDictionaries>
        	<ResourceDictionary Source="Styles\ButtonStyle.xaml" />	
	</ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

then i build it, and make another window app project, i copied the style and has same Resource dictionary

Project 2 has Reference Project 1

App.XML in Project 2 With FontWeight Normal and Foreground Black

<Application.Resources>
    <ResourceDictionary>
	<ResourceDictionary.MergedDictionaries>
        	<ResourceDictionary Source="Styles\ButtonStyle.xaml" />	
	</ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

Said that i have a button1 in Project 1, when in visual studio it display correctly to have Font Bold and Color Red.

in Project 2 i call the button1 in project 1, but it display Font Normal and Color Black. so the button1 use the style in project 2.

as my button1 in user control, so i move the resource definition in usercontrol.Resource, it display correctly even if i call the button1 from project 2.

but, it will be very complicated if i have many button with separate usercontrol to define the styles each user control.

so how i can make my resource defined for entire project 1, without being overwritten by project 2?

Thanks for advance.