Question

When trying to set a ComboBox SelectedIndex to 0 so I have the first value as default, doesn’t work, the combobox its empty by default. If I try setting it to any other number it works, I have the selected index as a default value.

Anyone have an idea why I can’t set it to 0 from xaml ?

<RSControls:SmoothScrollComboBox
    Grid.Column="1"
    x:Name="comboTypes"
    Margin="7,0,0,0"
    SelectedValue="{Binding Path=SelectedTypes}"
    SelectedValuePath="Name"
    SelectedIndex="0"
    ItemsSource="{Binding Source={StaticResource GroupedTypes}}"
    DisplayMemberPath="Display"
    SelectionChanged="comboTypes_SelectionChanged"
    IsSynchronizedWithCurrentItem="True">

PS: forgot to mention that I have 2 comboboxes, the other one works, implemented in the same way, only the Selectedvalue and ItemSource differs.

Answer 1

It’s probably because you are setting the selected item twice: once with SelectedIndex and once with SelectedValue

Remove the SelectedValue property and SelectedIndex should work