I have a view that has a viewmodel as its datacontext, The question I have is that I need to know the height and width of the view, trying to do mvvm. What is the best way to let the viewmodel know the Height and Width of a view?

Is multibinding using a converter the best way or is there another?

hello,

I have an empty parent window, in runtime i add the child user control to it.

i want to resize my parent window according to the different child contents, i have used SizeToContent but it does not worked for me.

i add this child user control in a GridControl of my Parent window. Is it possible to resize main window according to child user control

<Window x:Class="WPF_RadDateTimePicker.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        xmlns:local="clr-namespace:WPF_RadDateTimePicker"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <Style x:Key="calendarStyle" TargetType="telerik:RadCalendar">           
            <Setter Property="AreWeekNumbersVisible" Value="False" />
        </Style>
    </Window.Resources>
 
    <StackPanel>        
        <telerik:RadDateTimePicker Width="100" VerticalAlignment="Center"
                                   CalendarStyle="{StaticResource calendarStyle}"
                                   telerik:StyleManager.Theme="Expression_Dark"/>
    </StackPanel>
</Window>

As soon as I reffer to the static calendarStyle the Expression_Dark theme is no longer correctly applied to the Calendar control 
otherwise works fine. How can I fix this?? ( I using 2010 Q3 version of the product)