private void EnableDeviceButtons()
{
// Values
var state = _controller.GetStateCurrentDevice();
bool selected = list_view_devices.SelectedItems.Count > 0;
bool runing = state != EDeviceState.Stoped;
bool recording = state == EDeviceState.Recording;
//lateral buttons
btn_tools.Enabled = selected && runing;
btn_remove.Enabled = !runing && selected;
btn_save.Enabled = !runing && selected;
btn_add.Enabled = !selected && cmb_device.Items.Count > 0;
//enable button image
btn_font_start.Enabled = !runing && selected;
btn_font_stop.Enabled = runing;
btn_video_start.Enabled = !recording && runing;
btn_video_stop.Enabled = recording;
}