To remove those components try this.
1. Create a blank project
2. Cut all the controls from you main project and paste them into the blank project.
3. Remove unwanted components (should work as there should be no controls on the form to utilize them)
4. Cut all controls from you blank project...
I think the rounding method you are trying to acheive is called Swedish Rounding. Google should give you an explanation on the rules. Below is a whole bunch of rounding methods I got off the MS website for a POS project, you may find the Bankers Rounding (BRound Routine) is the most suitable...
I have had a problem with a Epson TM printer before running on a POS unit, try installing it as a Generic - Generic / Text Only printer and when prompted for a printer name put down the correct name, eg Epson TM-300B
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