Hello Mark,

What you can do to enlarge the size of tab area is to set some margins to it. To do so you need to set TabAreaMargins of TabGroupSettings like this:

var tabGroupSettings = this.ultraTabbedMdiManager1.TabGroupSettings;

//  Set tab area margins to add some space between tab area border
//  and tabs
var tabAreaMargins = tabGroupSettings.TabAreaMargins;
tabAreaMargins.Top = 20;
tabAreaMargins.Left = 20;
tabAreaMargins.Right = 20;
tabAreaMargins.Bottom = 20;

Please note that under the tabs we are drawing a line and some padding by default. We achieve this by drawing two UIElements - TabLineUIElement for the line and TabClientAreaEdgeUIElement for the padding. Right now there is now build in property or method to set the appearance of these elements. If you need some space under the tabs you need to force these elements to stop draw themselves. You can achieve this by implementing DrawFilter. In the attached sample project I have implement this approach for you.

Please check my sample and let me know if this is what you are looking for or if I am missing something.

Yes, you can set the height of each group run time. What you need is to set the Extent property of each group. If what you need is all the groups to have the same height, you can set Extent of all the groups to same value. Please note, if the sum of groups’ extents does not match the MDI client are the height of each group is recalculated proportionally. This way you even do not need to calculate the exact height you need – only set same value for each group.

Please check the attached sample where I have implemented this for you and let me know if you need any further assistance.