View internal signals when simulating testbech (.vht) in ModelSim-ALTERA

After writing and compiling my .vhd program, I create a testbench in Quartus II (Processing > Start > Start Test Bench Template Writer). This process creates a .vht file.

After editing and saving the .vht file, I start ModelSim-Altera from within Quartus II. Upon opening, I compile the .vho files first, and then the .vht file second. I then simulate the .vht file. When adding waveforms, I'd like to add internal signals that are in the .vhd program. However, when searching the objects view for these signals (because only the inputs and outputs are shown), some signals are found while others are not. Moreover, when simulating, the signals I did find do not simulate correctly. The fix action I have found for this is to port these signals to the top and look at them as an output.

Is there a way to look at these internal signals without porting them to the top?

Let me know if I need to clarify. Thanks.