Hi,
Is it possible in a RadComboBox to open the dropdown when we start typing?

I tried in the event of OnKeyUp putting IsDropDownOpen = true, but then the textbox text is selected, so the next key pressed delete the current value. To avoid this behavior I have placed the cursor at the end, but the second key makes no value is selected, even if there are possible values to be selected in the list.

Hello Carles,

You could try setting the OpenDropDownOnFocus property to true. This will open the dropdown when the combo receives the focus, which is usually when the user starts typing.

Sincerely yours,
Valeri Hristov
the Telerik team

Hi, Valeri

You are wrong.
Then control got focus and when user starts typing are very different events.
So, i have problem like Carles:
How to open dropdown when user starts typing?

I understand that receiving focus and typing are different things :) However, this is the closest functionality to the requirement, that comes out of the box.

You could use the following hack instead:

<UserControl.Resources>
    <local:TextToDropDownOpenConverter x:Key="TextToDropDownOpenConverter" />
</UserControl.Resources>





 

<telerik:RadComboBox x:Name="combo1" IsEditable="True"
IsDropDownOpen="{Binding Text, Converter={StaticResource TextToDropDownOpenConverter}, Mode=TwoWay, RelativeSource={RelativeSource Self}}" ... />

public class TextToDropDownOpenConverter : IValueConverter
{
    private string text;
 
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        this.text = (string)value;
         return true;
    }
 
    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return this.text;
    }
}

Sincerely yours,
Valeri Hristov
the Telerik team