Dynamic text box and minus variable?

I have a text box with dynamic text set to display p variable but when the variable goes < 0 it only displays a '-'.
im using:
onClipEvent (enterFrame) {
p = my_object._x;
How can I correct this? Also another question with 'my_object._x' it returns the x coord relative to the movie clip it is in. How do I get the position relative to the 0,0 (top left corner)?
I've been learning Flash for 2 days so sorry if the questions sound simple. I have tried googling these.

for the textfield question....
I'm not too sure about that... it could be related to the width of the textfield, or maybe a maxChars setting on the textfield....not really sure sorry. Someone else may have an answer....
for the other question...
getRect() gives you the bounding box (without stroke width, use getBounds() if you want bounds outside the stroke width)
try
var geometricBounds = my_object.getRect();
trace(geometricBounds.xMin+","+geometricBounds.yMin)

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Dynamic text box and minus variable?

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