.net - Silverlight - 根据条件禁用网格中的按钮

Question

我是 silverlight 的新手，我必须根据条件在网格中禁用简单的任务禁用按钮！我知道在 asp.net 中这很容易，但我无法弄清楚如何在 Silverlight 中做到这一点。

Xml代码：

 <sdk:DataGrid Style="{StaticResource DataGridStyle}" Width="900" SelectionMode="Extended" RowDetailsVisibilityMode="Collapsed" ItemsSource="{Binding Path=PagedRooms}" SelectedItem="{Binding Path=CurrentRoom, Mode=TwoWay}" AutoGenerateColumns="False" x:Name="outerdatagrid" >
                    <sdk:DataGrid.RowDetailsTemplate>
                        <DataTemplate>
                            <sdk:DataGrid  ItemsSource="{Binding Path=ResourceAllocationTimePeriods, Mode=TwoWay}" x:Name="unblockBedGrid" AutoGenerateColumns="False" Width="850" Height="Auto" HorizontalAlignment="Left" Grid.Row="1" SelectedItem="{Binding Path=CurrentResourceAllocationTimePeriod, Mode=TwoWay}">                                    
                                <sdk:DataGrid.Columns>
                                    <sdk:DataGridTextColumn IsReadOnly="True"  Header="Allocated From" Binding="{Binding Path=StartDate,Mode=OneWay, Converter={StaticResource dateConverter}}" />
                                    <sdk:DataGridTextColumn IsReadOnly="True"  Header="Allocated To" Binding="{Binding Path=EndDate,Mode=OneWay, Converter={StaticResource dateConverter}}" />              
                                    <sdk:DataGridTemplateColumn>
                                        <sdk:DataGridTemplateColumn.CellTemplate>
                                            <DataTemplate>
                                                <Button Height="23" Name="btnReleaseBed" Content="Release" Command="{Binding Path=ReleaseBedCommand}" />
                                            </DataTemplate>
                                        </sdk:DataGridTemplateColumn.CellTemplate>
                                    </sdk:DataGridTemplateColumn>                                      
                                </sdk:DataGrid.Columns>
                            </sdk:DataGrid>
                        </DataTemplate>
                    </sdk:DataGrid.RowDetailsTemplate>
                </sdk:DataGrid>