Newly opened form (as a child) hosted inside Window MdiTab does not receive focus or activated.
WJ-7309 is fixed in version 1.2.8 that has just been uploaded.
We will discuss how to improve the mdi preview tab handling.
It is now fixed. If you discuss tab handling in the future, you may consider whether a new tab is placed before or after the current tab, always at the end or beginning of the Mdi tabs.
Just my two cents.
I would like also to suggest that MdiTab has a property that if multiple tabs occupy the full width of the screen, the next tab should be added in the second row instead of scrolling horizontally.
thank you, it´s logged as WJ-7309.