Controlling the input cursor position for gtext

I think I understand this problem, just looking for a work-around:

I use a user-response via the intput function to accept a candidate model shown in a plot. If the model is accepted, the user is to hit enter. Works fine.

Then later in the calling script, after plotting several model functions (within a for loop) I use gtext to annotate the plot.

Before have a chance to place the cursor for the gtext response I get the fatal error message;

****************************

Error using matlab.graphics.primitive.Text/set

Error setting property 'Position' of class 'Text':

Value must be a 2 or 3 element vector of numeric or logical type.

Error in gtext (line 55)

set(ht, 'String', string(rows,:), 'Units', 'data', 'Position', [x y 0]);

Error in WatersSegsmModel_psd (line 284)

gtext(gtxt,'FontSize',12);

********************

If I then enter the gtext statement at the prompt, it works perfectly well.

SO - apparently the user-entered return during the model selection is being interpretted by gtext as a misplaced cursor position.

HOW DO I AVOID THIS CONFUSION?

Thanks.

Chuck Medler