The Bees fought back from 2-0 down to earn the point.
Frank said, "Leicester were better than us in the first half. They dominated possession without being very dangerous. They scored a set piece goal, they hit the post but otherwise didn't dominate us.
"We made two changes after they scored a second in the second half. I just know the mentality of this group of players. The way they fought their way back into the game was very impressive.
"Not many teams will come here and go 2-0 down but get back into the game.
"The way Dasilva has come back now, even stronger and produced a moment we know he can produce. So pleased, so happy."
He added, "It is very important.
"You always want a good start. It is so important to get that point or get those points, there are a lot of positives we can take away - the bounceback mentality, but there is also a lot to work on, which is good as we can only improve."