when adding entry to the page a margin is added. The space between the Entry and other controls is significant:
this is a sample xaml:
<VerticalStackLayout>
<telerik:RadEntry x:Name="entry" Placeholder="telerik entry" BackgroundColor="AntiqueWhite" />
<telerik:RadEntry x:Name="myentry" Placeholder="telerik entry" BackgroundColor="AntiqueWhite" />
<Entry Placeholder="maui entry" BackgroundColor="LightBlue"/>
<Entry Placeholder="maui entry" BackgroundColor="LightBlue"/>
</VerticalStackLayout>
this is the result: