Python Pandas Plot has Gaps when using Sparse Dataframe

Question

When I try to plot the following data

import pandas as pd
dfx = pd.DataFrame()
dfx['bing'] = [1,2,3,np.nan,np.nan,np.nan,np.nan,np.nan,np.nan]
dfx['bang'] = [np.nan,np.nan,np.nan,4,5,6,np.nan,np.nan,np.nan]
dfx['boo'] = [np.nan,np.nan,np.nan,np.nan,np.nan,np.nan,7,8,9]
dfx.plot()
plt.show()

I get this line with gaps. I want to be able to make use of the different colors for different segments of my line, but would like it to be "connected" as well.