Sheet stack bug in 7.0

[Peter Haworth]

If you are using the sheet stack command with the "in stack" option, it's
broken in 7.0 and 7.0.1.

The sheet stack is not displayed as a sheet in the target stack but more
importantly, the handler that issues the sheet command continues to execute
instead of waiting for the sheet stack to close.

QCC Report# 14076.

Pete
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