To you a window indoors may appear to have plenty of sun, but to a plant it's dull compared to even a dull day outside. Most plants need lots of light to flower, and by cutting it, you may in fact cut off latent buds, but if you've had experience with that tree, and it worked, why not just repeat what you did, or do you just not know where to cut (and when matters too - spring is usually best). You should be fertilizing every 10 days-2 weeks in spring and summer, monthly in winter with a fertilizer that has a higher middle number (of the usual 3) on the label, to encourage flowering.

thanks for the info about the window. i will try to get a sun light. the problem with the flowering, i do not know what i did when i cut it back. i had no reason to cut other than to shape it. i will also look at my fertilizer and check the middle number. thanks for the help.