Hello Martin,

Both #1 and #2 work, 3 wont. . For instance, to change the label background of IGThemed XamDataGrid, you can do this:

<igDP:XamDataGrid BindToSampleData="True" Theme="IGTheme">
            <igDP:XamDataGrid.Resources>
                <LinearGradientBrush x:Key="{ComponentResourceKey {x:Type igDP:XamDataGrid}, LabelBackground}" StartPoint="0,0" EndPoint="0,1">
                    <GradientStop Offset="0" Color="Red"/>
                    <GradientStop Offset="0.93" Color="Green"/>
                    <GradientStop Offset="0.98" Color="Blue"/>
                </LinearGradientBrush>
            </igDP:XamDataGrid.Resources>
        </igDP:XamDataGrid>

All the brushes used by a component can be found in the brush xaml file in the default styles of the component group. 

However, some files so many brushes, so looking at the xaml can be quite confusing. For that I would recommend getting a tool that can inspect the elements and help you here(like snoopWPF).

Inspecting looks like this:

I've also attached the sample I used for this screenshot, it contains a dockmanager with some colors changed using #1 method. 

Should you have any further questions, please let me know.

Sincerely,

Tihomir Tonev
Associate Software Developer
Infragistics

Hello Martin,

All of the DataPresenter themes consist of three files in total. In this case, they are:

DataPresenterRoyalDark
DataPresenterRoyalDark_Brushes
DataPresenterRoyalDark_Express

While in this sample there are a lot of brushes, there are styles in the other files using brushes as static resources. If you inspect these files, you will see that sometimes there is a merged dictionary pointing towards the Generic files of the theme.

This is because there are some shared styles. 

What needs to be done in this case, is to overwrite all mappings, so they point to the resources you have defined.

I have modified the sample you have sent me. What I did was to add overwrite of the rest of the mappings as per the guide on our website here:

Well your sample just doesn't work.

See my attached sample. I played around with it and managed to turn a lot of stuff red, but not the hover effect. Also it seems like its a hover effect from an unstyled xamdatagrid, its not usual royal dark one.

Is it just not possible turning purple to blue? I don't understand how no one has ever done this before. How can this not be a common request?

Hello Martin,

I have been looking further into this, and it seems that including brush resources is not guaranteed to work in this case, since brushes are used as static resources within the base theme, so they don't get resolved by styles using them.

There are a couple of suggestions I can make in this case.

First is, if the color is not broadly used in the application, just styling the component will do the job. In this case, DataRecordCellAreaBackground brush, is used only by the style for the DataRecordCellArea, meaning a style like this will resolve:

<Style BasedOn="{x:Static themes:DataPresenterGeneric.DataRecordCellArea}" TargetType="{x:Type igDP:DataRecordCellArea}">
<Setter Property="Background" Value="Red" />
</Style>

The other option would be to include the resource dictionary that represents the base theme and merge it with the new resource dictionary that you will point.

I am attaching a sample extending Royal theme by overwriting few colors. 

Sincerely,
Tihomir Tonev
Associate Software Developer
Infragistics