Open combobox column popup in one click

[Yaroslav]

Hi,
By default you need three clicks to open popup. Using EditTriggers="CellClick" - two clicks.
Is it possible to open combobox popup in one click? (similar as you can change Checkbox column state in one click)

[Maya]

Hi Yaroslav,

You may set an implicit style targeting RadComboBox and set the OpenDropDownOnFocus property to "True":

<UserControl.Resources>
    <Style TargetType="telerik:RadComboBox">
        <Setter Property="OpenDropDownOnFocus" Value="True"/>
    </Style>
</UserControl.Resources>

Still you need to keep the setting of the EditTriggers to "CellClick".
 

Greetings,
Maya
the Telerik team

[Yaroslav]

<Style TargetType="telerik:RadComboBox">
    <Setter Property="OpenDropDownOnFocus" Value="True"/>
</Style>

It didn't help. I still need two clicks.

this is example of combobox columns that I use:

<telerik:GridViewComboBoxColumn Header="Branch" DataMemberBinding="{Binding BranchAddressId, Mode=TwoWay}"
          ItemsSource="{Binding Addresses, Source={StaticResource customerRes}}" EditTriggers="CellClick"

          SelectedValueMemberPath="CustomerAddressId" DisplayMemberPath="BranchName" IsComboBoxEditable="True"/>

[Maya]

Hi Yaroslav,

I am sending you the sample project I used for testing the case. Let me know in case of any misunderstandings.

 

All the best,
Maya
the Telerik team

[Yaroslav]

Thanks for your sample project. I found where is the problem:

<telerik:RadGridView Name="clubsGrid"
                             EditTriggers="CellClick"
                             AutoGenerateColumns="False"
                             Margin="5"
                             telerik:Theming.Theme="Office_Blue">

telerik:Theming.Theme="Office_Blue"

If you apply this theme one click doesn't work (I didn't try other themes. May be the same). May be I use themes in wrong way?
One more situation when one click opening doesn't work (there is no theming):
click comboboxcolumn cell, popup list appears, then click another comboboxcolumn cell. nothing happens.

Improtant remark:

<telerik:RadGridView Name="clubsGrid"
                             EditTriggers="CellClick"
                             AutoGenerateColumns="False"
                             Margin="5"
                             telerik:Theming.Theme="Office_Blue">
<telerik:GridViewComboBoxColumn.EditorStyle>
                                <Style TargetType="telerik:RadComboBox">
                                    <Setter Property="OpenDropDownOnFocus" Value="true" />
                                </Style>
                            </telerik:GridViewComboBoxColumn.EditorStyle>
                        </telerik:GridViewComboBoxColumn>

works fine!

[Maya]

Hi Yaroslav,

When setting a Theme, the implicit style for the RadComboBox is overridden. However, once you explicitly set the EditorStyle, this style on the other hand overrides the style defined by the Theme. That is why the approach you found out is working properly. 
As far as the issue with opening the drop-down is concerned, if you open a cell in the GridViewComboBoxColumn, without closing its drop-down, it will be expected that the next drop down will not be opened immediately as the first click is used for taking the previously edited (through the RadComboBox) cell to get out of edit-mode.

 

Regards,
Maya
the Telerik team

[Yaroslav]

Hi, Maya.
Thank you for your explanation.