I am a local lender here in Las Vegas...
Most Down Payment Assistance Programs available that I know of will provide funds if you qualify but you will have to come up with the minimum required down payment from your own funds.
For example, if doing an FHA loan, you will still have to bring the minimum down payment required of 3.5% of your own funds. The "down payment" funds only apply towards the closing costs and principal reduction.
All Western Mortgage