How to apply different styles for the column headers in an Infragistics UltraWinGrid - infragistics

We are using the Infragistics UltraWinGrid version 11.1.
We want to assign different styles (actually a different gradient) for some of the column headers in the same grid.
I have already tried things like
- defining 2 styles in the isl file and assigning them via StyleResourceName
- setting UseOsThemes to DefaultableBoolean.False
- setting column.Header.Appearance.ThemedElementAlpha to Alpha.Transparent
but to no avail.
Any help is appreciated.

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How to turn off the icons in a SharePoint standard List?

I found nothing about this icons. How can I hide it? Is it possible?
Unfortunately, it is not possible to hide the icons on modern experience list forms using SharePoint out of the box capabilities.
These icons are specific to column type you are using in your list.
Example: Single line of text, Choice, Number, etc.
The icon you highlighted is related to the Yes/No column in SharePoint:
You can hide those by customizing the list for using Power Apps: Customize a Microsoft Lists or SharePoint form by using Power Apps
But, I don't think it is worth to do it using Power Apps just to hide the icon which is SharePoint default functionality.

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I read a lot about iOS and manually setting some text (titles/headers) above. But the intention is to use a build-in functionality, that this title belongs to a column and when changing the width of the title, the column is also changed. Also a double click will sort the entire list accordingly to the clicked column up or down. The width of the columns will also automatically fit the content.
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I'm working on a sitecore project where i'm using WFFM (Web Forms For Marketers), I have a form and would like to change the styling of a date picker. By default it appears with -'s. I ant /'s.
One way would be:
$('.scfDatePickerTextBox').val().replace(/-/g,'/')
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When adding a date field, it always shows up as three droplists:
see this image: http://content.screencast.com/users/MoonCrawler/folders/Jing/media/627a9a76-de8d-4ad7-9097-81e21d38f54c/2013-01-30_1658.png
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