SQL Server 2012 :: Dynamically Grow A Data File?

Is it possible to dynamically grow a data file for TempDB?

I have some TSQL that I want to execute (this is raw tsql, not something I'd typically share) when I get an alert that TempDB is growing.

SET NOCOUNT ON;
DECLARE @TempDB TABLE (FileID tinyint, name varchar(50), size bigint)
DECLARE @TotalSize decimal(19,4), @TotalFiles int, @CurrentTempDBSize bigint, @SQL varchar(1000), @DBName varchar(50)
SET @SQL = ''
INSERT INTO @TempDB

[code]....

ENDThe code runs fine, but doesn't actually increase the size of the file.