all

I just start c# wpf coding and it comes a problem I can not find a solution.
The grid will show one company in a row and the last column has a button
to do further process.

xaml looks like this:

                <DataGridTemplateColumn Header="Operation">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Button Name="btnShowOrders" ToolTip="Show orders" Click="showOrders">
                                <materialDesign:PackIcon Kind="FileFind" Width="15" Height="15" />
                            </Button>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>

In this case this button need to get company id in column 1 and use id to query orders belong to that company display in popup windows.

I want button rendered only if this company has order but can not make it happen.
There 2 problems:

1. I code a property in viewmodel return false and button visibility bind to this property but button still always rendered
2. I has a dictionary in viewmodel which has map of company id and order count. How can I use it to hide button if that company’s order count is zero

Thanks for helping newbie,