default directory after a program is launched?

**Describe the bug**
I just start using gdbgui, so my questions might not be issues at all. But I do need help on them. One thing is I cannot click to choose the target executable but have to paste its path, is it the case? Second, after gdbgui loads the executable, shell pwd still reports the default directory to be home directory. Does the directory coincide with where gdbgui is launched? I hope we could be given the freedom to choose the working directory where input files resides.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

**Expected behavior**
(1) give windows like click to choose directories for exectuable
(2) provide way to specify working directory.

**Screenshots**
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**Please complete the following information:**
* OS: linux mint 18.2 installed in a virtualbox with windows 7 as host
* gdbgui version (`gdbgui -v`):0.13.0.0
* gdb version (`gdb -v`):7.11.1
* browser [e.g. chrome, safari]: firefox 62.0.3 in linux
* python packages (`pip freeze`): pip 8.1.1

**Additional context**
Add any other context about the problem here.