Backcourt Violation During Throw-In

[imagomer]

I'm Red coach. On a throw-in on Red's frontcourt sideline, Red fails to catch (Vgirls) and establish team control. (Official agreed, no team control was established) Defense never touched the ball. Ball goes into the backcourt; Red chases and touches and controlled the ball in their backcourt. Official called a backcourt violation. Was this correct? I thought that front court team control needed to be established before a backcourt violation could occur. The Official was very clear and sure of his call - he clearly understood my objection and quickly, succintly explained his interp very confidently. Good enough for me: I've got girls to try to coach. Was he correct? Thanks.